Jack for heel turning machines



March 5,1940. N. w. KINNEY JACK FOR HEEL TURNING MACHINES Filed Oct. 4, 1937 2 Sheets-Sheet 1h March 5, 1940. N. w. K1NNEY JACK FOR HEELv TURNING MACHINES Filed O'ct. 4, 1957 2 Sheets-Sheet 2 v l DY:

Patented Mar. 5, 1940 UNITED STA-'TES PATENT oFricE 2,192,552 JACK FOR HEEL TURNING MACHINES Norton Kinney,y Groveland, Mass.l Application October 4, 1937, Serial No. 1`i7,122

' s claims. (ci. 12--875 My invention relates to wood heel turning machines and it has particular reference to the jacks thereof.

The object of the invention is `to improve the' construction of wood heel turning machines and more especially to provide an improved jack for machines of this class.

Accordingly, I have provided an improved jack for wood heel turning machines, said jack hav- `ing the features of construction and mode of voperation set forth in the following description,v the several novel features of the invention being separately pointed out anddefined in the claims at the close thereof.

In the accompanying drawing,

Fig. i. is a sideelevation partly in section of a wood heel turning machine jack constructed in accordance with my invention. y v

Fig. 2 is a section on line 2--2 of Figs. 1 and l7.

Figs. 3 and Il are, respectively, side elevation and bottom plan View of the cap hereinafter referred to.

Figs. 5 and 6 are details illustrating the construction of the lower end of the jaw carrier hereinafter referred to.

Fig. 7 is a section on line '1 7 of Fig. 1.

Figure 8 is a View like Fig. 1 but showing the relationship of the parts when the operating lever, hereinafter described, occupies its uppermost position.

Figure 9 is a sectional view View similar to Fig. 7 but showing the relationship of the parts when the operating lever occupies its uppermost position shown in Fig. 8.

In the illustrated embodiment of my invention l indicates generally the body or frame of my improved jack. This body is formediwith a base portion i l and an integral upstanding cylindrical portion l2, said base il being radially disposed with respect to the tubular portion i2. 'I'he tubular portion l2 serves as a housing for certain parts of the mechanism as will presently be described while the base portion H is pivotally mounted at i3 within the usual yoke lll provided at the upper end of the usual spindle l5.

In wood heel turning machines the spindle l is rotatably supported by the usual support so that the frame or bodyv lll can be swung up and down on pivot i3, laterally on the axis of spindie i5 and also moved bodily sidewise in the well known manner to present the opposite sides of the work to the cutters of the machine.

The base ll is provided with a jaw l5 on to which the wood heel blank is fixedly clamped by means oi an upper adjustable jaw I7.` While the the. stem 25 against rotative displacement.

woodheelblank'is thus clamped rigidly in the jack the operator utilizes an upstanding handle i8 provided' on'the jaw i? and a radially dis.

posed handle i9 of a lever 23 to manipulate the jack while the cutters of the machine operate upon the wood heel blank.

rThe upper jaw il is rigidly fastened bymeans of va screw 2t to a jaw carrier 2i herein shown as a tubular member mounted to slide endwise within the tubular portion l2 ofthe body or frame of the jack. a

Fulcrumed at 22 within boxes 42 at the lower end of the carrier 2i is the lever 23 of whichthe handle is a rigid part and this lever carries a'roll 2li whose axis is oiset somewhat with 2151 cooperates with a head 25 rigidlyV attached to a stem 2E which extends upwardly from said head a cross-bar iorming a rigid part of the tubularrv portion i2 of the body or frame of the jack.

Above the cross-barv 28 the stem 2h isprovided with a shoulder 29 to cooperate with the top side c -of the cross-bar as will be described'. This shoulder29 is the bottom side of a radial ange provided upon the stem 26 and' at oppositesides thereof this iiange is formed with notches 36, Fig. 2,.whicl'i are occupied by two screws 3l ex-` tending through threaded apertures provided in the cross-bar t. Thus the two screws 3l hold At their lower ends the screws 3| abut the upper end .oi the spring 2l, Fig. 7, and it will be clear t that by adjusting these screws the normal downward press-ure of said spring against the headI may be regulatedas desired.- y

As shown in Figs. 1', 2 and 7 the cross-bar Z8 extends through longitudinal slots 32 formed at opposite sides of the jaw carrier 2l while its opposite extremities are snugly tted within apertures 'provided at opposite sides of the tubular portion l2 or" the body or frameand held against displacement therein by means of a countersunk screw 33. The upper jaw Il is made with a base portion formed with corrugations 34 meshing with corrugations 35 provided upon the jaw carrier 2i', said base portion occupying a longitudinal slot 36 formed in the rear side of the tubular portion l2 of the base or frame.

The screw 2i! occupies a slot 31 formed through 15 respect to the axis or the iulcrum 22. This roll jaw I1 may be adjusted longitudinally on the carrier 21 and when extreme adjustment is made the screw 2G can be transferred from one threaded hole 3S to the other, if necessary.

In Fig. 1 of the drawing the lever' 23 is shown in its lowermost position and the spring 21 is compressed between the two screws 3| and the head 25. Since the two screws 3l arecarried bythe cross-bar 28 forming part of the body or frame of the jack and the lever 23 is fulcrumed upon and within the lower end of the carrier 2I it will be clear that the spring is forcibly urging the head 25 downwardly and, through the roll 24, lever 23 and carrier 2l, is also forcibly urging the upper jaw I1 downwardly against the top of the heel 353. Thus during the operation of turning a heel the blank is forcibly held by the two jaws by reason of the pressure of the spring 21.

W'hen the lever 23 is swung upwardly in the direction indicated by the arrow in Fig. 1 the spring 21 is permitted to expand downwardly until the stop shoulder 29 rests on top of the crossbar 28 as shown in Figs. 8 and 9, after which continued upward movement of the outer end of lever 23 permits two coiled springs 111.1, Figs. '7, 8 and 9, to move the jaw carrier 2l and upper jaw I1 upwardly, thereby releasing the work 39.

The ulcrum 22 of lever 23 is provided by two axiallyalined trunnions 131 projecting from opposite sides of lever 23, said trunnions being journaled within boxes i12 which are confined within sockets 43, Figs. 5 and 6, provided at opposite sides of the lower end of carrier 2l and held against radial displacement therein by the tubular portion I2 of the frame and the lever 23 which latter occupies the space between said boxes. Each box I2 is made with a downwardly extending stem 44 slidably mounted in an aperture provided at the lower end of the tubular portion i2 of the frame and the coiled springs [Ill are mounted on these stems between the boxes I2 and the bottom wall of the tubular part I2 of the frame.

The hub portion of the lever 23 occupies a slot t5, Fig. 1, provided at the lower end of the tubue lar portion i2 of the frame and also a slot 46, `Figs. l, 5 and 6 provided at the lower end of the jaw carrier 2i. Opposite the slot i6 the jaw carrier 2l is cut away or slotted as at A1 which provides clearance for movement of roll 22 down-v wardly relatively to carrier 21! on which the lever 23 is fulcrumed. i

'Ihe upper ends of the tubular portion I2 of the frame and oi the tubular jaw carrier 2i are closed by a cap 22, Figs. l, 3, 4 and '7, and this cap is made upon the inner side or its skirt portion with bosses 33, Fig. 4, adapted to occupy an annular groove 52a, Fig. 9, provided upon the exterior of the cylindrical portion I2 of the body or frame near the upper end thereof. The skirt of the cap 48 is slitted as at 5f) to render the same resilient so that cap 2S can be sprung on to and off of the upper end of the cylindrical portion I2. Also, two holes 5I are provided through the top wall of the cap through which a screw driver may be inserted when it is desired to adjust the abutment screws 3l.

From the above description it will be clear that my improvedl jack is of very simple and compact construction and it has the advantage that all of the movable parts thereof, with the exception of the lever 23 and upper jaw I1, are completely inclosed within the housing provided by the telescopically associated tubular parts I2 and 2I so that all of the inclosed parts are shielded from dirt, dust and chips.

At 52 I have shown an adjustable stop screw for limiting the downward swinging movement of the lever 23.

The boxes 42 within which the trunnions dl of the lever are journaled, t into the sockets i3 at the lower end of the jaw carrier so that they are interlocked with the latter and in effect are rigid parts thereof and must move up and down with said jaw carrier. The cross-bar 28 which indirectly serves as an abutment for the upper end of the heavy spring 21 is in ellect a rigid part of the tubular portion I2 of the frame while the downward pressure of the heavy spring 21 is always opposed either by the roll 24 when lever 23 is in its lowermost position. or by the engagement of stop shoulder 29 with the cross-bar 28 of the frame when lever 23 is in its uppermost position. It should therefore be clear that when the lever 23 is in its uppermost position and stop 29 is against the cross-bar 28 of the frame the spring 2'! is merely confined between the head 25 and the upper abutment screws 3l and does not exert pressure on the jaw carrier in either direction. Therefore, with lever 23 in this uppermost position the two small relatively weak springs lil) are free to lift the jaw carrier 2i and jaw I1 to iree the work 39. It should also be clear that when the lever 23 is swung from; its

uppermost position to its lowermost position the seats on the work and thereafter continued downward movement of lever. 23 acts to compress the heavy spring 21 thereby increasing the pressure of the jaw I1 against the work until a dead center condition exists between the axis of the lever fulcrum, the axis of roll 24 and the crest of head 25.

When this dead center condition exists the small springs MI are abnormally compressed through the initial downward movement of the jaw carrier 2I while the heavy spring 21 is also abnormally compressed during the latter part of the downward swing of lever 23. In other words, when lever 23 is swung upwardly this mechanism moves upwardly under the influence of springs 40 and when lever 23 is swung downwardly it utilizes the head 25 as a fulcrum to force said mechanism downwardly, first compressing the springs 40 and thereafter compressing the spring 21.

From the above description it will be clear that the carrier 2I, jaw I1, boxes l2 and lever 23 jointly constitute the movable jaw mechanism of my new jack organization which mechanism is at times moved bodily upwardly to release the work by the two small springs 40 and at times is moved bodily downwardly by the lever 23, the

downward movement thereof being limited by the engagement of jaw I1 with the work after which continued downward swinging movement of lever 23 compresses the spring 21.

What I claim is:

l. A. jack for heel turning machines comprising a body provided with a iiXed work-holding jaw; a movable jaw mounted on said body so that it is slidably adjustable bodily on rectilinear path toward and from said fixed jaw; an abutment spring carried by said body, and a prising a body provided with a xed work-holding jaw; a movable jaw mounted on said body so that it is adjustable toward andfro-m said Xed jaw; an abutment spring carried by saidbody, and a lever whose fulcrurn is connected and bodily movable with said movable jaw, said lever being cooperatively associated with said abutment spring and operable when swung in one direction to compress said spring so that the latter reacts through said lever and itsiulcrurn to clamp said movable jaw against the work and also serves to hold said lever in work clamping position. v

3. A jack for heel turning machines comprising a body provided with a ixed work-holding jaw and with an upstanding tubular portion having an apertured cross-bar within the same; a movable jaw mechanism comprising a tubular carrier slidably mounted within the tubular por-- tion of said body and provided with a. workclamping jaw `extending laterally therefrom through a longitudinal slot` formed in said tubular portion, said tubular carrier being vformed at its opposite sides with slots through which said cross-bar extends; a hand lever pivotally mounted within the lower end portion ci said tubular carrier; a stem slidably mounted within. one of the apertures of said cross-bar made with a stop shoulder for engagement with the top of said cross-bar and provided at its lower end with a head to co-operate with said lever, and a coiled spring within said carrier disposed between said cross-bar and said head, said lever coi-operating with said head whenswung in one directionto compress said spring to cause the latter to forcibly urge said lever, tubular carrier and movable jaw downwardly thereby to clamp the work inv position upon the fixed jaw.

4. A jack of the character described constructed in accordance with claim 3 and wherein a relatively weak spring is provided for moving said carrier, its jaw and said lever upwardly thereby to `free, the work when said lever is swung in the opposite direction.

5. A jack of the character described constructed in accordance with AclaimA 3 and wherein a stop is also provided for limiting the upward movement of said carrier under the inuence of said relatively weak spring.

6. A jack of the character described construct-r ed in accordance with claim 3 and wherein one of the apertures of said cross-bar is threaded and wherein there is provided an adjustable abut- :ment screw mounted in said threaded aperturel with its lower end abutting the upper end or said coiled spring. v

'7. A jack of the character described constructed in accordance with claim 3 and wherein there is also provided removable closure means for the upper end of said tubular portion of said bodyf 8. A jack of the character described constructed in accordance with claim 3 and wherein` one of the apertures of said crossbar is threaded and including also an adjustable vabutment screw mounted in said threaded aperture whose lower end abuts the upper end of said coiled spring, and a closure cap removably attached to the up'- per end of saidtubular portion of said body, said cap being formed with an aperture through its, top wall in axial alin'ement with said screw throughv which said screw is accessible for adjustment.

NORTON W..KINNEY. 

